I have a 400 Chevy SB in my 1991 YJ (worst choice on the planet btw). I've had constant cooling issues living in the high desert of eastern Oregon. I ended up putting in a factory clutch fan as the only way to control it. On the track, however, it was useless. So I bit the bullet and installed this electric fan and hooked it up to a battery. The only issue I had with installing it was that the fan was hanging about 2 inches below the heatsink. So to get maximum thrust through the cooler I ended up attaching a flat piece to the gap and I haven't had any cooling issues since. The fan runs 20-30 seconds after I turn off the engine and sometimes runs a second time for about 15 seconds. When I installed the fan I also installed an oil cooler and a tranny oil cooler which I'm sure also helps keep it cool. I would recommend if you have this fan installed but your rig is still getting hot, look into additional coolers. If I could chill this 400 I would think you can chill anything. Just thought I'd share my findings.
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